Entirely pointless, I agree, so no problem if one is happy being non-compliant with 411.3.1.1 of BS7671.Door switches only have 2 terminals, there is nowhere to connect any earth, and it would be entirely pointless using 3 core cable for them, assuming you could actually get the larger 3 core cable to fit into them.
I wonder how Mr Jobsworth (particularly Mr post-PRS-legislation Jobsworth) would code this on an EICR?
Kind Regards, John